Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 204, in _process_transaction
    self.commit_packages(trans, *trans.packages)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 265, in commit_packages
    self._apply_changes(trans)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/worker.py", line 926, in _apply_changes
    self._cache.commit(fetch_progress, inst_progress)
  File "/usr/lib/python2.7/dist-packages/apt/deprecation.py", line 98, in deprecated_function
    return func(*args, **kwds)
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 427, in commit
    res = self.install_archives(pm, install_progress)
  File "/usr/lib/python2.7/dist-packages/apt/deprecation.py", line 98, in deprecated_function
    return func(*args, **kwds)
  File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 394, in install_archives
    install_progress.finish_update()
  File "/usr/lib/python2.7/dist-packages/aptdaemon/progress.py", line 266, in finish_update
    lock.status_lock.acquire()
  File "/usr/lib/python2.7/dist-packages/aptdaemon/lock.py", line 69, in acquire
    raise LockFailedError(self.path, process)
LockFailedError: Could not acquire lock on /var/lib/dpkg/lock. The lock is hold by apt-get.